SmartFTP client not free anymore?

Hello everyone,

Well, I was using SmartFTP client version 2.5 so far but I got the usual message to update the client to be able to continue to use it for free, and when I install the new version, it shows a message stating that I have 5 days left on this version. Do you know what's happening? Please reply me as soon as possible, any reply should be appreciated.